The Model 14
Dual Voltage Processor

Two independent 3 in, 3 out voltage processors with SUM, MIN and MAX outputs.

Full bipolar processing of input voltages with offset

Bi-color LEDs tell you how it really is

VC equal power output crossfader


External signal injection to A/B crossfade inputs

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One thing that has historically typified 'West Coast' analog instruments was a somewhat broader focus on control voltage devices over those that make or process sound. Keeping with that tradition, the Plan B Model 14 Dual Voltage Processor affords a pallet of powerful processing tools which allow the user to bend multiple control voltage sources into various complex altered states.

What does a Voltage Processor do?:

A voltage processor is a device which combines and alters numerous control voltage signals in varied ways which, in most cases, would not be available through straight connection to their final desitination. It has multiple inputs where different signals are fed, and in the case of the M14, mutliple outputs each producing a different processing function. Two advantages of processors afford bipolar atttenuation for VC inputs on modules which don't have them, as well as feathering multiple CV sources to a single input,.

CV Processing:

The Model 14 is fitted with two independent processors, each having 3 inputs and three distinct outputs. Each input has full bipolar attenuation (see figure 1) yielding dynamic inversion and attenuation of it's input signals. This is one way the Model 14 processes control voltages.
Figure 1 - Bipolar Attenuation explained

Secondary processing comes from a +/- sum offset pot which shifts the sum of it's inputs positively or negatively. And unique to the Model 14, both processors have three outputs which perform three different functions as follows:

SUM . Outputs the SUM of the input voltages (Voltage Adder)
MIN . Outputs the MINIMUM voltage of the combined inputs
MAX . Outputs the MAXIMUM voltage of the combined inputs

Each side of the M14 has been fitted wirh a dual-colored LED for precise visual indication of it's SUM output activity:

VC Crossfading

The center section of the Model 14 consists of a manual/VC crossfader which is normalized to the SUM outputs of Processors 1 and 2. However, two independent signal INJECT inputs (one per axis) supercede the Xfader's internally-routed connections, allowing for crossfading between external signals, ~or~ by connecting only one to an external source, crossfading from external signals to processor sum outputs ~or~ crossfading from either an external input or processor output to nothing, thus acting as a linear VCA (thanks to Chris Sawyer for this suggestion).

Audio Applications:

While the signal conditioning functions of the M14 are geared towards control voltage applications, it leads a double life as an audio signal mixer. The bipolar attenuators provide for easy phase reversal. The MIN or MAX outputs perform a rather unique function as well: the loudest of the three inputs become predominant ('biggest voice gets the mic'). Incorporating a pair of linearized SSM2164 chips, the Model 14's EQUAL POWER TRANSFER xfader maintains seamless morphing between axis with no deads spots or audible drops in signal level (no 3 dB drop at center).

A diverse module, the Model 14 is functionality equivalent to two Doepfer A-138c's, an A-172, an A-132 and an A-138a .

Production Modules:

Model 1 Protected Power Source

Model 9 Mixer/Attenuator

Model 10 Polyphonic Envelope

Model 11 Evil Twin Bandpass Filter

Model 12 State Variable Vactrol Filter

Model 13 Dual Timbral Gates

Model 14 Dual Voltage Processor

Model 15 Complex VCO

Model 16 Spectral Multiplexer

Model 17 Triple Event Timer

Model 23 Analog Shift Register
ELF SERIES

Model 24 Heisenberg Generator

Model 25 Multi-tasking Audio Processor

Model 26 Multi-tasking Control Processor

Model 28 Programmable Tap Clock

Model 29 Dynamic Mult

Model 36 Leveler ELF SERIES

Model 37 ELF LFO ELF SERIES

Model 38 ADSR
ELF SERIES

Model 38A ADSR Expander
ELF SERIES

Model 39 Wave Splicer
ELF SERIES

Model 40 Headphone PreAmp
ELF SERIES

|Planned Modules:

Model 18 Stereo Output Mixer Sub System:

Model 18 Stereo Mixer

Model 18A Expander (VC level/pan)

Model 18B Balanced Stereo Outputs

Model 19 Gate Delay

Model 21 MIlton Controller Series

Model 27 Digital Delay

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